> There is> advice to use RAID 5 if 90% or more of the operations are reads and> 10 if not. I don't know the distribution of reads and writes.

Try to understand the whys instead of just using rules of thumb.

This specific advice comes because RAID 5 is just as great for
reads as striping, but lousy for writes.

So one could put it another way: use RAID 5 if your need to $ave
is greater than your need for (write) speed, 10 otherwise.

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